For the chickpea salad: In a medium bowl, using a fork or pastry blender, mash the chickpeas and avocado together until incorporated, but still chunky. Add the green onion, lime juice, mayonnaise, mustard, garlic, salt and pepper, and stir until mixed. If you want a spicy hot kick, add the cayenne. Refrigerate for at least 1/2 hour before serving.
For the sandwiches: Cut the pitas horizontally to create pockets. Spread the chickpea salad mixture into each pita pocket. Top with cucumber slices, sprouts, radishes and lettuce.
You can pulse the chickpea salad ingredients in a food processor for a smoother consistency, but I like the chunkiness of mixing by hand.
Adapted from "Trisha's Table: My Feel-Good Favorites for a Balanced Life" by Trisha Yearwood © Clarkson Potter 2015. Provided courtesy of Trisha Yearwood. All rights reserved.